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United States Patent | 5,050,994 |
Kipphan ,   et al. | September 24, 1991 |
A method of monitoring dampening-medium feed in an offset printing machine includes scanning non-printed areas in a region of given inked areas by a device of an opto-electric transducer, and evaluating signals generated by the scanning; and a device for performing the foregoing method.
Inventors: | Kipphan; Helmut (Schwetzingen, DE); Loffler; Gerhard (Walldorf, DE) |
Assignee: | Heidelberger Druckmaschinen AG (Heidelberg, DE) |
Appl. No.: | 405639 |
Filed: | September 11, 1989 |
Sep 09, 1988[DE] | 3830732 |
Current U.S. Class: | 356/445; 101/147; 356/446 |
Intern'l Class: | G01N 021/55; G01N 021/47 |
Field of Search: | 356/445,446 250/563 101/147 |
3053181 | Sep., 1962 | Jorgensen | 356/446. |
3234871 | Feb., 1966 | Ostwald | 101/142. |
4737035 | Apr., 1988 | Aoki et al. | 356/445. |
4876457 | Oct., 1989 | Bose | 250/563. |
Foreign Patent Documents | |||
569356 | Jul., 1985 | AU. | |
8182887 | Mar., 1987 | AU. | |
0011376 | Oct., 1983 | EP. | |
0283899 | Sep., 1988 | EP. | |
80046 | Nov., 1971 | DE. | |
2141247 | Mar., 1972 | DE. |
Publication Fogra-Instituts Bulletin, Special Edition, Wirz et al: "Cooperation of Printing Ink and Water in Offset Printing"; 1979, pp. 45-60. "Advances in Printing Science and Technology"; 17th International Conference of Printing Research Institutes, Saltsjobadan, Sweden, Jun. 1983, W. H. Banks, pp. 206-227. |